i had to go get chicken feed yesterday.so i priced the safeguard wormer.an it was $30 a block.so if my figures are right itll take 10 to 15 blocks to worm the cows an calves.
Each spring, I use Dectomax pour on. It lasts for 40 days, and when I let the cows and calves out on lush, green pasture (and this is where the majority of worm larva are), the cows will be out eating all these little larva, and vacuuming them up. Since the Dectomax works for so long, the majority of the larva are killed early in the spring, and I have a much lower worm infestation for the rest of the summer. In the fall, I use a different wormer like Safeguard or something else with a different mode of action.
Texas likely has a totally different parasite profile, so maybe Safeguard is the best for your situation.
I think our neighbors use those blocks, but they have soo many it would be insane to use the pour on. This reminds me I should really check my calendar and probably do mine before I let em loose! lol
We use the pour on wormer as well. Usually ivermectin.
The problem I see with the blocks is being able to regulate the amount of wormer each animal gets. Plus you have to make sure the block doesn't get wet and disolve.